Cruise boosting (CB for short) is an exploit useful in BFBB speedruns. It can be triggered by using Bubble Bowl and Cruise Bubble on the same frame while on a flat surface. A faster and more useful CB can be done by then strafing left/right against an object to capture the walking speed into the cruise boost.
Cruise boosting works because the the cruise bubble cancels the bubble bowl, which causes it to not end properly. This causes the game to continue pushing spongebob forward as if he was still in the bubble bowl animation.